With the exception of Eland, a .30-06 is plenty of gun for any other plains game you can hunt in Southern or East Africa. Can other guns do a better job, probably for some of the bigger stuff, but the '06 is plenty, and would work adequately for Eland too. Now, if I could only take 1 rifle to Africa for plains game, ever, it'd be my .338 win mag, with which I do most of my hunting. If a guy could only take 1 rifle to Africa for all game, you'd never do better than the venerable .375 H&H. It is very versatile and can handle anything from dik-diks to elephants, and handle all of them well too.